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Electrochemistry and Emerging Contaminants: Molecular Insights for Innovative Solutions

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Physical Chemistry and Chemical Physics".

Deadline for manuscript submissions: closed (20 February 2026) | Viewed by 708

Special Issue Editor

Special Issue Information

Dear Colleagues,

Environmental pollution is one of the main problems affecting our planet. Everyday human activity (domestic, industrial, economic and commercial) produces a whole range of contaminant substances. Despite the attempts to limit their impact, many of these contaminants end up damaging the environment.

The implementation of different analytical methods and the development of new detection techniques have revealed the existence of certain contaminant substances in the environment (medicines for human and animal use, toxins, antioxidants, hormones, cosmetics, drugs of abuse, plasticizers and industrial additives, anti-corrosion protectors, heavy metals, pesticides and insecticides, etc.) and have raised concern about the very negative impact that these pollutants have both on ecosystems and on the health of living beings.

For this reason, it is necessary to look for alternative and/or complementary treatments to those currently available, in order to achieve its elimination.

Electrochemistry provides simple methods to address these environmental problems. The application of electrochemical methods to solve environmental problems is producing very promising results. Thus, for example, the electrochemical remediation of soils and aquifers has allowed the removal of various pollutants and toxic substances in these media (pharmaceuticals, herbicides, industrial waste).

In this Special Issue, research papers or comprehensive reviews related to advances in the development of different electrochemical methods that enable the removal of these emerging contaminants or on chemical reactions, molecular mechanisms, etc., are welcome.  All article research submissions should involve research at the molecular level as well as verified experiments.

Prof. Dr. Miguel A. Esteso
Guest Editor

Manuscript Submission Information

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Keywords

  • electrochemistry
  • chemical reactions
  • removal
  • environmental pollution

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Published Papers (1 paper)

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Research

17 pages, 2657 KB  
Article
Polyethyleneimine-Directed In Situ Gold Deposition on Gallium Nitride Nanoparticles for Enhanced Electrochemical Detection of Erythromycin
by Oana Elena Carp, Denisse-Iulia Bostiog, Elena Laura Ursu, Rares-Georgian Mocanu, Narcisa Laura Marangoci, Ion Tiginyanu and Alexandru Rotaru
Int. J. Mol. Sci. 2026, 27(6), 2728; https://doi.org/10.3390/ijms27062728 - 17 Mar 2026
Viewed by 396
Abstract
Hybrid nanomaterials that integrate surface functionality, colloidal stability, and efficient electron-transfer pathways are highly attractive for improving electrochemical sensing performance. Herein, we report the fabrication and evaluation of polyethyleneimine-functionalized gallium nitride nanoparticles (GaN) decorated with gold nanoparticles (GaN-PEI-Au) as a tunable electrode modifier [...] Read more.
Hybrid nanomaterials that integrate surface functionality, colloidal stability, and efficient electron-transfer pathways are highly attractive for improving electrochemical sensing performance. Herein, we report the fabrication and evaluation of polyethyleneimine-functionalized gallium nitride nanoparticles (GaN) decorated with gold nanoparticles (GaN-PEI-Au) as a tunable electrode modifier for enhanced differential pulse voltammetry (DPV) detection of erythromycin. Branched polyethyleneimine was employed as a multifunctional interfacial layer to stabilize GaN dispersions, introduce amine-rich surface chemistry, and enable in situ gold nanoparticle formation at the GaN-PEI. The optimized GaN-PEI-Au material exhibited high colloidal stability, a characteristic Au localized surface plasmon resonance in the ~520–525 nm range, and well-defined Au nanoparticles attached to the GaN surface. When applied as an electrode coating, GaN-PEI-Au significantly enhanced the erythromycin oxidation response compared to bare Au and GaN-PEI interfaces, consistent with synergistic increases in electroactive surface area and interfacial charge-transfer efficiency. Under optimized DPV conditions, GaN-PEI-Au-modified electrodes enabled quantitative erythromycin determination with a linear range of 5 nM–2 µM (R2 = 0.990), sensitivity of 1.32 × 10−3 µA nM−1, and a limit of detection of 52.5 nM, while maintaining stable baseline behavior during repeated scans. The reported GaN-PEI-Au nanocomposites represent a robust platform for sensitive electrochemical detection of pharmaceutical compounds. Full article
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